help with simple chat app

hey i seek help with making a simple chat app. I am a complete beginner with making actually usable apps for users with remote access. I’ve only made websites with implemented javascript and php with local databases. I know my way around c++, python, js, php, html, mysql and a bit of javascript express as well as mongodb and mongoose. It’s gonna be my first actual real life project so i really need help as i don’t know how to actually make it work so aro